Ja4 on Vitalii Zaiats https://vitalii-zaiats.com/tags/ja4/ Recent content in Ja4 on Vitalii Zaiats Hugo en-us Sun, 19 Jul 2026 00:00:00 +0000 A TLS fingerprint won't tell you it's a bot — what it reaches for will https://vitalii-zaiats.com/posts/tls-behaviour-not-resemblance/ Sun, 19 Jul 2026 00:00:00 +0000 https://vitalii-zaiats.com/posts/tls-behaviour-not-resemblance/ Most tools ask whether a TLS fingerprint resembles Chrome. I wanted a different question — how does it behave? So I sat inside a residential proxy network, named a million handshakes, and found the bulk of the ‘bot’ traffic isn’t faking Chrome. It’s driving it.